Two 29(R) Squadron Typhoon's, a FGR4 and a T3 lining up on 25 at Coningsby as 'Triplex' flight. The triplex markings have been a tradition with the squadron since the 1920's and the story goes that the markings originate from a mistake by the painter when asked to mark two X's, then IX, who then misunderstood this to be two X's and one X. The tradition has stood ever since.